A computational fluid dynamics model of a 20Kg induction stirred laboratory scaled ladle
2005 (English)In: Proceedings of the COMSOL Multiphysics User´s Conference 2005 Stockholm, 2005Conference paper (Refereed)
Over the years numerous Computational fluid dynamics models [1,2,3,4,5,6,7,8] have been developed, in order to study the fluid flow in gas and induction stirred ladles. These models were used to gain more insight in the industrial processes used in ladle treatment of steel. In this paper a computational fluid dynamics model of a 20 Kg laboratory scaled induction ladle (Situated at the Dept. of Material Science and Engineering - KTH) is presented. This particular laboratory furnace can be equipped with an electromagnetic stirrer, which can be used to agitate the steel melt. The CFD model so developed will make it feasible to have information about the fluid flow in this particular laboratory furnace. This information would promote the analysis of experimental results and the implementation of new strategies. The objective of this paper is to obtain an understanding and insight of the ladle refining process by solving the electromagnetic force field and predict the flow pattern produced by these force fields using a single straight induction stirrer, with the help of 20Kg laboratory scaled furnace. The size of this 20Kg laboratory scaled furnace is very small compared to the size of electromagnetic stirrer because of which the magnetic field inside the ladle will essentially be two dimensional. The magnetic field component in third dimension (Y-direction) is very small compared to other two (X and Z direction) hence a two dimensional model also provides a better understating of the model. The flow field produced by a straight induction stirrer is of complex nature due to the three dimensional electromagnetic force and the flow phenomenon. In order to provide more information about the stirring of molten steel within the ladle, which is essentially a three-dimensional phenomenon, a three-dimensional model is also presented incorporating equations governing the fluid flow as well as the electromagnetic forces in the system. Both the models two and three – dimensional are developed in two parts. First, the calculation of electromagnetic forces, which is done with the help of FEMLAB3.1 and second, using these electromagnetic forces (Lorenz forces) as the source term for solving incompressible Navier stokes equation to compute the velocity profile of the agitated melt, which is done by combining the Electromagnetic module with Chemical Engineering module of commercial software FEMLAB 3.1. The CFD model so developed is verified using experimental measurements of the magnetic flux in the laboratory furnace. This CFD model of the induction ladle is developed with the possible extension of the model in mind, i.e. it should be easy to expand the model to incorporate temperature as well as transport of chemical species and non – metallic inclusions.
Place, publisher, year, edition, pages
FEMLAB 3, 1, induction ladle, electromagnetic Lorenz forces, magnetic stirrer, mangetic diffusion equation, Navier-stokes equation
Engineering and Technology
IdentifiersURN: urn:nbn:se:kth:diva-97892OAI: oai:DiVA.org:kth-97892DiVA: diva2:534111
QS 20122012-06-152012-06-152012-06-15Bibliographically approved